My sons informed me that I'm getting a Sig Sauer MPX for Father's Day because they found a great deal somewhere and the wife told me no more guns! I just watched a few YouTube videos and the rifle uses 88/90 gram co2 cartridges and I'd like to use 12 gram co2's. Which adapter works best and what are you using with your MPX or MCX? I'm ordering a couple of 90g co2's but I want to hear from forum members first to see what you're using. I've found assorted adapters on eBay, Amazon and PA and reviews are all over the place. I think the kids got the MCX because I recently purchased a Sig M17 and hinted I'd like to get a Sig rifle someday but someday was like next year. I'm liking the M17 but my gun is pellet picky. I've used Crosman HP, Pointed and RWS Diabolo Basic pellets and after 4 reloads the gun leaves a few in the pellet belt between reloads plus the gun jammed with pointed pellets, I'm hoping my pellets work better with the MCX. BTW, the MCX looks awesome in the reviews, very military and realistic. I've got all the air guns I need for the CV19 Zombie Apocalypse!